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From: "John Slade" <sladerj@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: A report on the IVO prop
Date: Mon, 9 Jan 2006 23:30:00 -0500
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Rotary people;
I'm really starting to like this IVO prop. The prop is very smooth
(noticeably smoother and quieter than the Performance 3 blade) and the pitch
adjustment makes a dramatic difference.  Take-off is much shorter now and
the climb keeps getting me too close to the Cessnas that took off 5 minutes
ago.

Today my take-off was proceeding normally - then I glanced at the boost
level. MAP was only 34. Hmmm. I gave her a bit more throttle, took the boost
to around 38 and she surged forward as though someone lit a rocket on the
back. Wha hoooo! This is the best performance I've ever had, and then some,
and there's a lot more left that I'm not using.

Cruising out of the pattern at just below max fine pitch I was doing around
130 kts with 5000 rpm. Once at 3000' I coarsened the pitch for about 3
seconds. (It takes 14 seconds to go from one limit to the other). RPM went
down to 4500, speed went up to 140 and I felt a pleasant push in my back.
OK. I brought the rpm back up to 5000. Speed went up to 150. Hmmm. This is
interesting. I went through the cycle again and things changed by about the
same proportions. I pretty sure I had quite a bit more adjustment to go on
the prop, and I didn't take the engine over 5600 rpm, but I was now reading
175kts TAS (170 averaged for wind) at 5600 rpm and only 34 map. Wow. I feels
like I finally found fifth gear after driving in fourth for two years. I
can't wait to find out what 6100 rpm at 12000' and 46 MAP will get me. Not
far short of orbital escape velocity and a long way past VNE would be my
guess. Unfortunately this won't happen until I have my new T04 turbo
installed.

I'll report more number on the IVO when I have them. Right now I'm having
way too much fun to take notes. :)

John
48.3 hrs, and finally getting what I'd hoped for.